as paul ryan and joe biden prepare to meet in their debate later this week, the presidential candidates will continue to narrow their focus with a romney swing through ohio and a presidential visit to florida. >> woodruff: tonight's edition of front line on pbs searches past the campaign trail for a fuller understanding of the two men competing for the presidency. one part of the two-hour documentary focuses on losing campaigns that helped shape each man: mitt romney's 1994 bid for the massachusetts senate seat held by ted kennedy, and barack obama's attempt to unseat a popular illinois congressman, former black panther bobby rush in 2000. this excerpt begins with an ad from the kennedy team that an angry romney attacked when the two men met for a debate. >> mitt romney says he helped create 10,000 jobs. the formers workers in indiana say something else >> i would like to say to the people of massachusetts if you think it can't happen to you, think again because we thought it wouldn't happen here either >> i want to know why you spent millions of dollars showing advertisements of strike